Electric furnace.



1. G. MARSHALL.

ELECTRIC FURNACE.

APPLICATION man ocT.1o, 1914.

1,149,203` .Patented Aug. 1o, 1915.

Umrnn stares PATENT OFFICE.

JAMES G. MARSHALL, 0F NIAGARA FLLS, NEW YORK, ASSIGNOR T0 UNION GARBID COMPANY, OF NEIN YQRK, N. YQ,

A C ORPORATION 0F VIRGINIA.

unicornio FURNAGE.

ini-49,2103.

Speecation of Letters Patent.

Patented Aug.`1o, 1915.

Application tiled 'Gctober 10, 1914.- Serial No. 865,977.

Niagara Fails, in the county of Niagara.

andState ofNew York, have invented certaln new and useful Improvements in Electric Furnaces, of which the follewing is a specification. y

`This invention relates'to electric furnaces and has for its object the arrangement of the furnace which `will allow an accumula'- tion of the material fromv the furnace to form 'a leyeron the tappingspout and bev automatically I naintained, therebj,f eliminating all-'expense lforrepa-irs to the front of 'the furnace, or' tothe tapping-spout, and

will vat the-same time deliver the product in the proper receptacle withoutwasting it by spilling it on the floor.

In operating electric furnaces great -eX- pense and inconvenience usually result from the ordinary arrangement of the tapping facilities; the ltappmtfspout,bemg exposed tothe molten material, usually melts out if made of metal, or oxidizes away if made of carbon or other substance of that character. Repairs to the spout, or renewals, in 'addition to causing an interruption in the cperation of the furnace, are costly and usually very inconvenient tov make.

In the accompanying drawings, Figure l is a vertical section of thev furnace on the .line I-I of Figs. 2 and 3, showing 'thel molten lfnaterialv pouring through an accumulation of chilled matter,`and also of an unprotected tapping-spout; F ig. 2 is a front view of the unprotected tapping-spout; and Fig. 3 is a front view of a protected tappingspout after discharging the furnace, show- -chilled layers lof In Fig. 1, fheffuma 1 iedesgnea with an overhung hearth 2, which allows the re-.

ceptacle or chill 6, for the molten metal orproduct, to project under the .furnace and permits the tapping-spout 3 to be merely a projection insuring the molten. metal or product entering the chill, the spout being so placed that under ordinary conditions, it is noteXposed to the direct heat from the molten metal or product coming from the furnace but is protected by al layer of 'chilled' material 4.- This is particularly true of a carbid furnace where the carbid on leaving the furnace chills rapidly, All

accumulation of carbid 4 occurs at the front.

of the tapping-holeand constitutes a supplementary self-formed tapping-spout vsupported by the' tapping-spout 3; the molten carbi 7 passes out of the tapping hole 5 and through the accumulation lof material 4 on the tapping-spout 3. Thetapping-spout,

. however, 1s not exposed directly tothe heat,

Vand is therefore not burnediout, but lasts for an indefinite period. The accumulation on thetapping-spout may be partly burned away, but-is automatically replaced at each tap by the molten material'7 coming from the furnace becoming chilled and adhering4 to vthe material which has-already accumulated thereon. After removing the charge,

the tap-hole is' plugged as usual.'

The spout is ametal .block and may be A made of cast iron; Fig. 3 shows the, layers of carbid 4 which have become solidied on thespout 3. Successive amounts of carbid rdrawn from the furnace come through this accumulation of carbid which serves as a supplementary spout and delivers` the molten Amaterial directly into the chill or ladle 6,

underneath; the spout simply supports this chilled carbid and practically no repairs are necessary in order to keep the front of the 4furnace in good condition for continuous operation.

1 By the termsdiiiicultlyfusibla and I heatinsulating as used in theclaims, it is intended that the product used' as a supplementary .tapping spouteL shall be more diliicultly fusible than the material .of which its supporting block 3 is ordinarily made:` and that it shall be a suiiiciently poor coneA ductor of heat to serve as a protector to the supporting block from the hi h temperature of the' stream of molten pro uct.

lWhile the improved tapping-spout is particularly advantageous in electric furnaces, it is obvious thatit is also advantageous in many other types of furnace.

I claim -1. In an electric furnace for making diiiicultly-fusible products, a self-formed spout of the chilled product of said furnace, and a support for said spout.

2. In an electric furnace, a hearth whose Wall has a tapping hole therein, a metal block below 'said tapping hole and having an outwardly projecting upper surface, a self-formed spout of the chilled difhcultlyfusible heat-insulating product of said furnace, the block serving as a support for the said self-formed spout.l

3. A carbid furnace, comprising a hearth, a spout formed of chilled carbid, and a support for said spout.

4. A furnace comprising a hearth, and a carbid spout leading ytherefrom.

`JAMES Gr. MARSHALL.

Witnesses SIDNEY Ons,

GEO. R. RUDD.

vCopies of this patent may be obtained for ve cents each,y by addressing the "Commissioner of Intent!4 Washington,1!. C. 

